After you modify the configuration items of a service, you must restart the service to validate the modifications. This topic describes how to restart a service in the E-MapReduce (EMR) console.
Background information
We recommend that you restart a service in rolling mode. Otherwise, business operations
may be affected. For instances deployed in primary/secondary mode, restart the service
on the standby instance first and then the service on the primary instance.
Notice If you clear Rolling Execute, the service is restarted on all nodes at the same time.
In this case, the service stops running during the restart. Proceed with caution.